Cherry Pi II

thingiverse

Introducing Cherry Pi II, an improved version of the original Cherry Pi Design! Based on hours of printing the initial design (http://www.thingiverse.com/thing:210028), this updated model offers several enhancements. The latest iteration includes additional .stl files featuring an Open Build V Wheels-compatible tower carriage, an effector with 3 x 25mm fan mounts, a modified bed clip for probing with FSRs, and a stepper mount/base with access holes for easier screw adjustment. Andy has also created a second set of delta rods at 200mm, resulting in improved print quality and a larger build area (approx. 200 x 200 x 200 mm). All electronics and PSU are now housed under the bed, with reduced tower and cross brace extrusions for increased rigidity. Delta rods have been shortened to 200mm, and limit switches are housed in top printed apex pieces. A re-designed Jhead mount allows for greater build height (270 mm), while a 250 mm diameter mirror serves as the print bed with a 95 mm print radius. The Marlin firmware has been updated to Rich Cattell's fork, and FSR Z probing is installed. Printed T nuts are used throughout (http://www.thingiverse.com/thing:28788), and a low-friction spool mount is included (http://www.thingiverse.com/thing:235925). The assembly instructions should be self-explanatory, with delta effector rods made from 6mm OD aluminium tubing and magnetic spheres glued into the effector and rod carriages. The carriage uses six 623 bearings attached with M3 SHCS, and GT2 belts are utilized with three 20-tooth machined pulleys and 5 meters of belt. Three top pulleys are made from two MR1052RS bearings and a printed crown pulley. Electronics include a RAMPS 1.4 board, RRD Smart LCD controller, four A4988 drivers, NEMA 17 40mm steppers, a stock JHead clone with a 40W 12V heater, and two part cooling fans attached with high viscosity CA. Andy plans to make a complete set of parts available for Cherry Pi II; please PM him for details.